A:发酵初期不通气,溶液中没有气泡产生
B:中期可以闻到酒香,说明进行了酒精发酵
C:后期接种醋酸菌,适当通气并保持原有温度
D:图乙中能正确表示pH变化的曲线是③
根据所学知识回答问题
一平行板电容器充电后两板间电压为3V,现使它的电量减少3×10﹣4C,发现两板电压降为原来的 ,则这个电容器的电容为____F,平行板电容器原来带电量为____C.
⑴Where is Jimmy?____
⑵What are the sheep doing?____
⑶What are you doing?____
⑷What is Amy doing?____
⑸Is he playing ping-pong?____
A. Yes, he is.
B. He is in the classroom.
C. She is singing and dancing.
D. I'm walking.
E. They're running on the grass.